Guapo Flub

Guapo Flub (real name Diablo Doom) is Fraz's younger twin brother and his best friend. He is also the spawn of Mr. Doom. He gave Fraz a brother with a personality he would hate in order to torture him, but Guapo had one defect; love. He loved his brother and slowly back off from picking on him. After Guapo found out about his true past he was somewhat haunted by it.

Fraz Flub
They were not just brothers but also best friends. But they didn't always get along. They still had their fights, but have a healthy relationship now.